Permit application information:
http://www.pima.gov/deq/water/septics.html
http://www.azdeq.gov/environ/water/engineering/index.html
General information about wastewater disposal systems:
http://www.azonsite.org/home.htm
http://www.nowra.org/index.html
http://www.nesc.wvu.edu/wastewater.cfm